Have you looked for any other Knights born in Worting or living in Worting in 1881 or 1891, to try and find the potential wider family?
If he was illegitimate, his mother may have married by 1891 and he might be listed under stepfather's surname. With two forenames, he might be listed by the second one, or a nickname e.g Fred for Alfred.
KNIGHT, Alfred Charles mmn -
1886 J Quarter Basingstoke Vol 02C Page 190